id say a good place to start is with posting a video of your 360 attempts, this way people can critique your form. there are a lot of things you could be doing wrong: setup carve, prewinding, keeping your shoulders rotated, not popping enough, and people wont be able to pinpoint a specific problem without a video. I learned 3's last year thanks to people on this forum and all i had to do was upload a video of my attempts.